Ariel

This scene where Ariel gets legs for the first time and spends time on the beach with no pants is probably my favourite scene in the movie.

Taken from the movie The Little Mermaid.

Daphne Blake & Velma Dinkley

Daphne is looking lovely as usual and this is one of Velma's only swimsuit appearances.

Taken from the Scooby-Doo Show episode The Creepy Case of Iron Face.

Turanga Leela

Taken from the Futurama episode Anthology of Interest I

May

In this episode May takes off all her clothes right on the beach to reveal this cute green two-piece.

Taken from the Pokemon Advance episode Brave the Wave.

Jerrica Benton, Kimber Benton, Aja Leith & Shana Elmsford

Here is a nice scene of the lovely ladies from Jem and the Holograms having a picnic in the park and being kidnapped at gunpoint. And all in their bathing suits! This is one of the best scenes in the series!

Taken from the Jem and the Holograms episode World Hunger Shindig.